llvm-project/clang/test/SemaCXX/warn-thread-safety-negative.cpp

// RUN: %clang_cc1 -fsyntax-only -verify -std=c++11 -Wthread-safety -Wthread-safety-beta -Wthread-safety-negative -fcxx-exceptions -DUSE_CAPABILITY=0 %s
// RUN: %clang_cc1 -fsyntax-only -verify -std=c++11 -Wthread-safety -Wthread-safety-beta -Wthread-safety-negative -fcxx-exceptions -DUSE_CAPABILITY=1 %s

// FIXME: should also run  %clang_cc1 -fsyntax-only -verify -Wthread-safety -std=c++11 -Wc++98-compat %s
// FIXME: should also run  %clang_cc1 -fsyntax-only -verify -Wthread-safety %s

#include "thread-safety-annotations.h"

class LOCKABLE Mutex {
 public:
  void Lock() EXCLUSIVE_LOCK_FUNCTION();
  void ReaderLock() SHARED_LOCK_FUNCTION();
  void Unlock() UNLOCK_FUNCTION();
  bool TryLock() EXCLUSIVE_TRYLOCK_FUNCTION(true);
  bool ReaderTryLock() SHARED_TRYLOCK_FUNCTION(true);

  // for negative capabilities
  const Mutex& operator!() const { return *this; }

  void AssertHeld()       ASSERT_EXCLUSIVE_LOCK();
  void AssertReaderHeld() ASSERT_SHARED_LOCK();
};


namespace SimpleTest {

class Bar {
  Mutex mu;
  int a GUARDED_BY(mu);

public:
  void baz() EXCLUSIVE_LOCKS_REQUIRED(!mu) {
    mu.Lock();
    a = 0;
    mu.Unlock();
  }
};


class Foo {
  Mutex mu;
  int a GUARDED_BY(mu);

public:
  void foo() {
    mu.Lock();    // expected-warning {{acquiring mutex 'mu' requires negative capability '!mu'}}
    baz();        // expected-warning {{cannot call function 'baz' while mutex 'mu' is held}}
    bar();
    mu.Unlock();
  }

  void bar() {
    baz();        // expected-warning {{calling function 'baz' requires holding  '!mu'}}
  }

  void baz() EXCLUSIVE_LOCKS_REQUIRED(!mu) {
    mu.Lock();
    a = 0;
    mu.Unlock();
  }

  void test() {
    Bar b;
    b.baz();     // no warning -- in different class.
  }

  void test2() {
    mu.Lock();   // expected-warning {{acquiring mutex 'mu' requires negative capability '!mu'}}
    a = 0;
    mu.Unlock();
    baz();       // no warning -- !mu in set.
  }

  void test3() EXCLUSIVE_LOCKS_REQUIRED(!mu) {
    mu.Lock();
    a = 0;
    mu.Unlock();
    baz();       // no warning -- !mu in set.
  }
};

}  // end namespace SimpleTest

namespace DoubleAttribute {

struct Foo {
  Mutex &mutex();
};

template <typename A>
class TemplateClass {
  template <typename B>
  static void Function(Foo *F)
      EXCLUSIVE_LOCKS_REQUIRED(F->mutex()) UNLOCK_FUNCTION(F->mutex()) {}
};

void test() { TemplateClass<int> TC; }

}  // end namespace DoubleAttribute